| 单词 | frost line |
| 释义 | > as lemmasfrost line frost line n. the limit beyond which frost does not form; esp. a depth in the ground below which frost does not penetrate. ΘΚΠ the world > the earth > weather and the atmosphere > weather > cold weather > [noun] > freezing or frosty weather > limit of frost frost line1850 1850 Ann. Rep. Commissioner Patents 1849: Arts & Manuf. 248 in U.S. Congress. Serial Set (31st Congr., 1st Sess.: House of Representatives Executive Doc. 20, Pt. 1) VI Buried as they [sc. stop valves] must be, beneath the frost line in the ground, they can be adjusted..without being removed from their permanent location. 1865 J. G. Whittier Snow-bound 160 While the red logs before us beat The frost-line back with tropic heat. 1964 L. H. Van Vlack Elements Materials Sci. (ed. 2) xiii. 385 A paving brick must contain a relatively high percentage of glass, unlike a ‘soft-fired’ drain tile which lies statically below the frost line. 2002 D. D. Chiras Solar House i. 41 Below the frost line, the ground stays a fairly constant 50°F. < as lemmas |
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